Measuring instrument.



v R. E. WOOLLEY. MEASURINGjNSTRUMENT. APPI I CATIOH HLED AUG-30' 19H.

Patented Aug. 13, 1918.

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UNITED STATES PATENT OFFICE.

new E. WOOLLfEibF SCHENECTADY, NEW YORK,

COMPANY,,A CORPORATION OF NEW YORK.

MEASURING INSTRUMENT.

Be it known that 1, Raw E. WOOLLEY, a the United States, residing at Schenectady,- county of Schenectady, State of, New York, have invented certain new and useful'lmprovements in Measuring Iiistruments, of which the following is a'specification.

The present invention relates to measuring instruments, and more particularly to lanimeters, although not necessarily limlted thereto.

The object an improved this type, and for a consideration of what to be novel'and my invention, attention is directed to the accompanying claims appended of the invention is to provide thereto.

, In the drawing, Figure 1 is a side elevation, partly in section, of a planimeter em-- bodying my invention; Fig. 2 is a top plan Fig. 3 is'a sectional View of a portion of the instrument.-

\ The planimeter shown is one adapted for use in connection with flow meter charts to integrate a record which has been traced thereon. 5. indicates a base plate having a post 6 projecting therefrom which serves to center a chart on the base plate and also pivot for the planimeter. The planimeter comprises a sleeve 7 to an arm 8 extending at right angles thereto. On thecnd of arm 8 is, a vertical pin 9 on which is pivoted a frame 10." Pivoted in the frame 10 on a horizontal axis 11 is a friction wheel 12 which turns on its axis when moved over the chart, and connected to the friction wheel to be turned thereby is a hub 12 having a groove 13 14v on an indicating wheel 15. O n'the arm 8 hetween its ends is a vertical pivot pin 16 on which ispivoted a frame 17 having an arm 18 in the end of which is a tracing point 19. On frame 17 is also a cam plate 20 having/a cam surface- 21 on which rides a pin 22 carried by frame 10 at one side of its pivot. 23 is a guard to .hold the pin 22 in engagement with the cam surfaces 21.

The structure thus far described is that of av known type of planimeteigthe operation of which is well \niderstood. and a more detailed description is deemed unnecessary to an understanding of the present inven- Specification of Letters Patent.

Application filed. August 30,

structure in an instrument of" manner as to strike the Patented Aug. 13, 1 918.

1917. Seria1No.189,000.

tion. Briefly the operation of such a pit.- nimeter is as. follows:

assrenoa roenueaat atac'rarc The instrument is removed from the base plate 5, a circularchart is put in place thereon the center of the chart fitting over the post 6 to positionit and hold it in place.

The instrument is then put back again, the

sleeve 7 fitting over post 6 andthe friction wheel 12 engaging the chart. eter is then pulled around by the handle The planim- 1 on the tracing point 19, the point being:

line on the chart.

pulled along the record of the point 19 The circular movement about the post 6 as a center moves the fr1c-" l0 erence around movement of the point 19 tion wheel 12 on a circumf post 6 and the about .the pivot the radial distance of point 19 from center postG turns the cam plate 20 and throu pin22 turns the frame 10, and hence t e friction wheel 12 on the vertical pivot pin 9. he amount which the friction wheel turns on'its horizontal pivot 11 in moving around the post makes with the radius passing through'its point of engagement with he chart as is well understood.

Now the friction must'be pivoted on frictionless bearings and be very carefully mounted if accurate re sults are to be obtained, and heretofore these pivots have often been damaged by the manipulator position on the base 5, this general by accidentally or otherwise d'ro'pping the sleeve 7 over the post 6 in such a friction Wheel on the base 5'. According to my invention, I provide an improved arrangement which acts as a safety device to prevent the planimeter wheels being injured when the planimeter is being put into position on the base 5. To this end the top of the post 6 is rovided 16 which results in varying I 6 depends on the angle which it wheel 12 of a planirneter with a threaded socketfl l into whic screws screwed down ment is such'that the friction wheel 22 will Just engage the chart when the stud 25 is as far as it will go. The threads on the stud 25 and in socket 24 may lave a suitable. pitch so as to lower the planimeter as slowly as found desirable.

vment as it must be always The arrangement, it will be seen. while it permits of the planimete being quickly and expeditiously put into place over the base 5, prevents any possible injury to the instruslowly moved through the screw arrangement during the latter part of its loweringmovement.

,In accordance with the provisions of the by Letters Patent of the United States, is:

l. The combination with a sleeve member and a post member Whl'Cll telescope one within the other, of a measuring device carried by one of said members and adapted to I which they are brought into telescoping reus lation.

2. In a measuring instrument, the combina tion with a sleeve member and a post threaded member and BEST AVAILABLE coP 1,276,818 v member which telescope one within the other to bring the measuring instrument to operative position, of means carried by one member and engaging the other and through which the latter part of the telescoping movement is effected by a turning movement of the members whereb injury of-the instrument due to the tw members. being quickly telescoped to final position is prevented.

3. .In a measuring instrument, the combination with a' over it, of a threaded member carried by the sleeve which engages the post before the sleeve reaches its final position thereon, said post ha vinga threaded part for engagement. with said threaded member whereby the sleeve may belowered theretlirough to its final position.

4. The con'ibination with a base hzwing a pivot post thereon, of a measuring instrument'having a sleeve which fits over the post and a pivot wheel which engages the base, and means for preventing the wheel from being brought forcibly into engagement the base when the sleeve is placed over the pivot post comprising a'screw thread by means of which the sleeve is lowereddur ing its final movement.

5. The combination with a base having a pivot post thereon, of a measuring instrument haying a sleeve wlnchhts over the post which engages the top of the post before the wheel engages the base, said post having a threaded part which cooperates With said by means of which the sleeve is lowered during its final movement. I

In witness whereof I my hand this 29th'day of August, 1917. R W E. WOOLLEY.

post, and a sleeve which fits have hereunto set 

